Melt together oil, wax and cocoa butter until just melted.
Stir in essential oil.
Pour into two muffin tin holes and put into the freezer to cool. That's it!
Notes
I like to heat up the muffin tin at 350F for a few minutes so they settle nicely into the holes.
If you want two different scents, don't stir in the essential oils, but pour them into the muffin tins, then individually scent each bar and stir well.
Feel free to use a mini muffin pan for small ones to give away!